Plac"id (?), a. [L. placidus, originally, pleasing, mild, from placere to please: cf. F. placide. See Please.]
Pleased; contented; unruffied; undisturbed; serene; peaceful; tranquil; quiet; gentle.
"That
placid aspect and meek regard."
Milton. "Sleeping . . . the
placid sleep of infancy."
Macaulay.
© Webster 1913.